A dehumidification control method for an air conditioning system

Abstract

This application provides a dehumidification control method for an air conditioning system. The air conditioning system includes a compressor with a first cylinder and a second cylinder, an indoor unit with a first indoor heat exchanger and a second indoor heat exchanger, an outdoor unit with a first outdoor heat exchanger and a second outdoor heat exchanger, a control valve group, a first circulation loop, and a second circulation loop. The control valve group includes a first four-way valve, a second four-way valve, a first throttling device, and a second throttling device. The first cylinder, the first four-way valve, the first outdoor heat exchanger, the first throttling device, and the first indoor heat exchanger are located on the first circulation loop. The second cylinder, the second four-way valve, the second outdoor heat exchanger, the second throttling device, and the second indoor heat exchanger are located on the second circulation loop, with the second indoor heat exchanger located downstream of the first indoor heat exchanger along the airflow direction. The method includes: determining to enter a first dehumidification mode; controlling the first circulation loop to operate in cooling mode and the second circulation loop to operate in heating mode. This method can improve comfort.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to a dehumidification control method for an air conditioning system. Background Technology

[0002] Air conditioning systems in related technologies generally have dehumidification functions. In summer, especially during the plum rain season, when the humidity in the air is high, the dehumidification function of the air conditioning system can be used to dehumidify the indoor environment.

[0003] However, when the air conditioning system in the relevant technology is running in dehumidification mode, the outlet air temperature may be too low, which may lead to an excessively low indoor temperature and thus affect the comfort of the indoor environment. Summary of the Invention

[0004] In view of this, the embodiments of this application aim to provide a dehumidification control method for an air conditioning system that can improve comfort during the dehumidification process.

[0005] To achieve the above objectives, one embodiment of this application provides a dehumidification control method for an air conditioning system. The air conditioning system includes a compressor, an indoor unit, an outdoor unit, a control valve group, a first circulation loop, and a second circulation loop. The compressor includes a first cylinder and a second cylinder. The indoor unit includes a first indoor heat exchanger and a second indoor heat exchanger. The outdoor unit includes a first outdoor heat exchanger and a second outdoor heat exchanger. The control valve group includes a first four-way valve, a second four-way valve, a first throttling device, and a second throttling device. The first cylinder, the first four-way valve, the first outdoor heat exchanger, the first throttling device, and the first indoor heat exchanger are disposed in the first circulation loop. The second cylinder, the second four-way valve, the second outdoor heat exchanger, the second throttling device, and the second indoor heat exchanger are disposed in the second circulation loop, with the second indoor heat exchanger located downstream of the first indoor heat exchanger along the airflow direction. The dehumidification mode of the air conditioning system includes at least a first dehumidification mode. The method includes:

[0006] Confirm entry into the first dehumidification mode;

[0007] The first circulation loop is controlled to operate in cooling mode, and the second circulation loop is controlled to operate in heating mode.

[0008] In one embodiment, the dehumidification mode further includes a second dehumidification mode, and the method further includes:

[0009] Confirm entry into the dehumidification mode;

[0010] Obtain the initial room temperature;

[0011] Determine whether the initial room temperature meets the first preset condition;

[0012] If so, then proceed to the first dehumidification mode;

[0013] If not, then proceed to the second dehumidification mode.

[0014] In one embodiment, if it is determined that the second dehumidification mode has been entered, the method further includes:

[0015] Both the first and second circulation loops are controlled to operate in a cooling mode.

[0016] In one embodiment, the first preset condition is: the first difference between the initial room temperature and the set dehumidification temperature is less than or less than or equal to a first set value, wherein the first set value is greater than 0°C.

[0017] In one embodiment, in the first dehumidification mode, the method further includes:

[0018] The opening degree of the second throttling device is adjusted according to the heating capacity of the second indoor heat exchanger.

[0019] In one embodiment, adjusting the opening of the second throttling device according to the heating capacity of the second indoor heat exchanger includes:

[0020] Determine that the initial operating time of the air conditioning system in the first dehumidification mode reaches the set duration;

[0021] Obtain the first current room temperature and the current temperature of the first indoor heat exchanger;

[0022] Record the first difference between the first current room temperature and the current temperature of the first indoor heat exchanger;

[0023] Obtain the current temperature of the second indoor heat exchanger and the exhaust temperature of the first cylinder;

[0024] The heating capacity of the second indoor heat exchanger is determined by using the current temperature of the second indoor heat exchanger, the exhaust temperature of the first cylinder, and the first difference.

[0025] The opening degree of the second throttling device is adjusted according to the judgment result.

[0026] In one embodiment, the method includes:

[0027] Determine whether the second difference between the current temperature of the second indoor heat exchanger and the first current room temperature is greater than or equal to 1 / 2 of the first difference;

[0028] If so, determine whether the exhaust temperature of the first cylinder is less than or less than or equal to a second set value, wherein the second set value is greater than 0°C;

[0029] If so, then reduce the opening of the second throttling device.

[0030] In one embodiment, if the exhaust temperature of the first cylinder does not meet the requirement of being less than or equal to the second set value, the method further includes:

[0031] Get the second current room temperature;

[0032] A third difference between the second current room temperature and the initial room temperature is determined to be greater than or equal to a third set value, wherein the third set value is greater than 0°C;

[0033] Increase the opening of the second throttling device.

[0034] In one embodiment, adjusting the opening of the second throttling device according to the heating capacity of the second indoor heat exchanger includes:

[0035] Get the third current room temperature;

[0036] The fourth difference between the set dehumidification temperature and the third current room temperature is determined to be greater than or equal to the fourth set value and less than or equal to the fifth set value, wherein the fifth set value is greater than the fourth set value;

[0037] Obtain the outlet air temperature of the indoor unit;

[0038] The heating capacity of the second indoor heat exchanger is determined using the outlet air temperature.

[0039] The opening degree of the second throttling device is adjusted according to the judgment result.

[0040] In one embodiment, the method includes:

[0041] Determine whether the fifth difference between the outlet air temperature and the set dehumidification temperature is greater than or equal to the sixth set value and less than or equal to the seventh set value, wherein the seventh set value is greater than the sixth set value;

[0042] If not, the opening degree of the second throttling device is adjusted according to the judgment result.

[0043] In one embodiment, adjusting the opening of the second throttling device based on the judgment result includes:

[0044] The fifth difference is determined to be less than or equal to the sixth set value;

[0045] Obtain the exhaust temperature of the first cylinder;

[0046] The exhaust temperature of the first cylinder is determined to be less than or less than or equal to the eighth set value, wherein the eighth set value is greater than 0°C;

[0047] Reduce the opening of the second throttling device.

[0048] In one embodiment, adjusting the opening of the second throttling device based on the judgment result includes:

[0049] The fifth difference is determined to be greater than or equal to the seventh set value;

[0050] Increase the opening of the second throttling device.

[0051] In one embodiment, after increasing the opening of the second throttling device, the method further includes:

[0052] Determine that the opening degree of the second throttling device has reached its maximum value;

[0053] Control the second loop to stop running.

[0054] This application provides a dehumidification control method for an air conditioning system. In a first dehumidification mode, the first circulation loop can condense and dehumidify the indoor airflow by performing a cooling operation, while the second circulation loop can heat the condensed and dehumidified airflow by performing a heating operation. This can minimize the excessive reduction of the indoor ambient temperature and improve the comfort of the indoor environment. Attached Figure Description

[0055] Figure 1 This is a schematic diagram of an air conditioning system according to an embodiment of this application. The hollow arrows at the indoor and outdoor units in the figure indicate the direction of airflow.

[0056] Figure 2 for Figure 1 The diagram shows the structure of the air conditioning system. The hollow arrows at the indoor and outdoor units indicate the direction of airflow, and the arrows on the first and second circulation loops indicate the direction of refrigerant flow in the non-stop dehumidification mode.

[0057] Figure 3 This is a schematic diagram of the first method of the dehumidification control method provided in the embodiments of this application;

[0058] Figure 4 This is a schematic diagram of a second method of the dehumidification control method provided in the embodiments of this application;

[0059] Figure 5 A schematic diagram of a third method of the dehumidification control method provided in the embodiments of this application;

[0060] Figure 6 A schematic diagram of the fourth method of dehumidification control provided in the embodiments of this application;

[0061] Figure 7 A flowchart of a dehumidification control method provided in an embodiment of this application;

[0062] Figure 8 A flowchart of another dehumidification control method provided in an embodiment of this application.

[0063] Explanation of reference numerals in the attached figures

[0064] Compressor 10; Opening signal port 11; First return gas port 12; Second return gas port 13; First exhaust port 14; Second exhaust port 15; Indoor unit 20; First indoor heat exchanger 21; Second indoor heat exchanger 22; Outdoor unit 30; First outdoor heat exchanger 31; Second outdoor heat exchanger 32; Control valve group 40; First four-way valve 41; Second four-way valve 42; First throttling device 43; Second throttling device 44; First circulation loop 50; Second circulation loop 60; Signal valve 70; First working port 71; Second working port 72; Third working port 73. Detailed Implementation

[0065] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed descriptions in the specific implementation should be understood as explanations of the purpose of this application and should not be regarded as undue limitations on this application.

[0066] In the description of this application, min represents the time unit minute, and ℃ represents the temperature unit degree Celsius.

[0067] One embodiment of this application provides an air conditioning system; please refer to [link / reference]. Figure 1 The air conditioning system includes a compressor 10, an indoor unit 20, a control valve group 40, a first circulation loop 50, and a second circulation loop 60.

[0068] The compressor 10 includes a first cylinder and a second cylinder, that is, the compressor 10 has at least two cylinders. Figure 1 The first cylinder shown has a first exhaust port 14 and a first return port 12, and the second cylinder has a second exhaust port 15 and a second return port 13. That is to say, the first cylinder and the second cylinder have independent exhaust ports and return ports, or the compressor 10 can be a double-suction double-row compressor 10.

[0069] In some embodiments, the first cylinder and the second cylinder may share the same exhaust port. For example, the gas discharged from the first cylinder and the gas discharged from the second cylinder may be mixed in the compressor 10 and then discharged through the same exhaust port.

[0070] The indoor unit 20 includes a first indoor heat exchanger 21 and a second indoor heat exchanger 22, that is, the indoor unit 20 is equipped with at least two heat exchangers.

[0071] The outdoor unit 30 includes a first outdoor heat exchanger 31 and a second outdoor heat exchanger 32, meaning that the outdoor unit 30 is also equipped with at least two heat exchangers.

[0072] The control valve assembly 40 includes a first four-way valve 41, a second four-way valve 42, a first throttling device 43, and a second throttling device 44.

[0073] The first cylinder, the first four-way valve 41, the first outdoor heat exchanger 31, the first throttling device 43, and the first indoor heat exchanger 21 are installed on the first circulation loop 50, that is, the first outdoor heat exchanger 31 and the first indoor heat exchanger 21 are used together.

[0074] The second cylinder, the second four-way valve 42, the second outdoor heat exchanger 32, the second throttling device 44, and the second indoor heat exchanger 22 are installed on the second circulation loop 60. That is to say, the second outdoor heat exchanger 32 and the second indoor heat exchanger 22 work together, which means that the first circulation loop 50 and the second circulation loop 60 are two independent circulation loops.

[0075] Please see Figure 2 The second outdoor heat exchanger 32 is located downstream of the first outdoor heat exchanger 31 along the airflow direction. In other words, the airflow generated by the indoor fan first flows through the first indoor heat exchanger 21 and then through the second indoor heat exchanger 22. This means that the second indoor heat exchanger 22 is located closer to the air outlet of the indoor unit 20.

[0076] The first circulation loop 50 and the second circulation loop 60 can operate in either cooling or heating mode, respectively.

[0077] by Figure 1 Taking the air conditioning system shown as an example, the circulation route of the first circulation loop 50 during cooling operation is as follows: the high-temperature and high-pressure refrigerant is discharged from the first exhaust port 14 of the first cylinder, enters the D port of the first four-way valve 41, and then flows out from the C port of the first four-way valve 41 into the first outdoor heat exchanger 31. After the refrigerant has undergone heat exchange in the first outdoor heat exchanger 31, it flows out from the first outdoor heat exchanger 31 and enters the first indoor heat exchanger 21 through the first throttling device 43 for heat exchange. After the refrigerant has undergone heat exchange, it flows out from the first indoor heat exchanger 21 and flows back to the E port of the first four-way valve 41. Then it flows from the S port of the first four-way valve 41 to the first return port 12 of the first cylinder and flows back into the first cylinder from the first return port 12, thus completing one cooling cycle.

[0078] Please see Figure 1The circulation route of the second circulation loop 60 during refrigeration operation is as follows: the high-temperature and high-pressure refrigerant is discharged from the second exhaust port 15 of the second cylinder, enters the D port of the second four-way valve 42, and then flows out from the C port of the second four-way valve 42 into the second outdoor heat exchanger 32. After the refrigerant has undergone heat exchange in the second outdoor heat exchanger 32, it flows out from the second outdoor heat exchanger 32 and enters the second indoor heat exchanger 22 through the second throttling device 44 for heat exchange. After the refrigerant has undergone heat exchange, it flows out from the second indoor heat exchanger 22 and flows back to the E port of the second four-way valve 42. Then it flows from the S port of the second four-way valve 42 to the second return port 13 of the second cylinder and flows back into the second cylinder from the second return port 13, thus completing one refrigeration cycle.

[0079] Please see Figure 1 The circulation route of the first circulation loop 50 during heating operation is as follows: the high-temperature and high-pressure refrigerant is discharged from the first exhaust port 14 of the first cylinder, enters the D port of the first four-way valve 41, and then flows out from the E port of the first four-way valve 41 into the first indoor heat exchanger 21. After the refrigerant has undergone heat exchange in the first indoor heat exchanger 21, it flows out from the first indoor heat exchanger 21 and enters the first outdoor heat exchanger 31 through the first throttling device 43 for heat exchange. After the refrigerant has undergone heat exchange, it flows out from the first outdoor heat exchanger 31 and flows back to the C port of the first four-way valve 41. Then it flows from the S port of the first four-way valve 41 to the first return port 12 of the first cylinder and flows back into the first cylinder from the first return port 12, thus completing one heating cycle.

[0080] Please see Figure 1 The circulation route of the second circulation loop 60 during heating operation is as follows: the high-temperature and high-pressure refrigerant is discharged from the second exhaust port 15 of the second cylinder, enters the D port of the second four-way valve 42, and then flows out from the E port of the second four-way valve 42 into the second indoor heat exchanger 22. After the refrigerant has undergone heat exchange in the second indoor heat exchanger 22, it flows out from the second indoor heat exchanger 22 and enters the second outdoor heat exchanger 32 through the second throttling device 44 for heat exchange. After the refrigerant has undergone heat exchange, it flows out from the second outdoor heat exchanger 32 and flows back to the C port of the second four-way valve 42. Then it flows from the S port of the second four-way valve 42 to the second return port 13 of the second cylinder and flows back into the second cylinder from the second return port 13, thus completing one heating cycle.

[0081] It should be noted that the above circulation route is mainly used to illustrate the flow direction of the refrigerant. The various physical changes that occur when the refrigerant circulates in the circulation route are common knowledge in this field and will not be elaborated here.

[0082] Another embodiment of this application provides a dehumidification control method for use in the air conditioning system provided in any embodiment of this application. The dehumidification mode of the air conditioning system includes at least a first dehumidification mode. Please refer to [link to relevant documentation]. Figure 3The dehumidification control method mainly includes the following steps:

[0083] Step S101: Confirm entry into the first dehumidification mode;

[0084] Step S102: Control the first circulation loop to operate in cooling mode and the second circulation loop to operate in heating mode.

[0085] Specifically, the first circulation loop performs cooling operation, in order to Figure 2 For example, the refrigerant flowing along the first circulation loop 50 absorbs heat and condenses to dehumidify when it flows through the first indoor heat exchanger 21.

[0086] The second circulation loop operates in heating mode, to Figure 2 For example, the refrigerant circulating along the second circulation loop 60 releases heat when it flows through the second indoor heat exchanger 22, thus raising the temperature of the airflow.

[0087] In other words, in the first dehumidification mode, the first circulation loop dehumidifies the indoor airflow by cooling, while the second circulation loop heats the airflow by heating. This can minimize the drop in indoor temperature and improve the comfort of the indoor environment.

[0088] Additionally, please see Figure 2 Since the first indoor heat exchanger 21 is located upstream of the second indoor heat exchanger 22 along the airflow direction, in the first dehumidification mode, the cold airflow that has been dehumidified by condensation at the first indoor heat exchanger 21 can exchange heat with the second indoor heat exchanger 22 when it flows through the second indoor heat exchanger 22 to form a hot airflow. The hot airflow is blown into the room through the air outlet, thereby better avoiding excessive reduction of the indoor ambient temperature.

[0089] In one embodiment, the dehumidification mode further includes a second dehumidification mode; please refer to [link to relevant documentation]. Figure 4 The method further includes:

[0090] Step S201: Confirm entry into dehumidification mode;

[0091] Step S202: Obtain the initial room temperature;

[0092] Initial room temperature refers to the currently obtained indoor ambient temperature.

[0093] Step S203: Determine whether the initial room temperature meets the first preset condition;

[0094] Step S204: If yes, then confirm entering the first dehumidification mode;

[0095] Step S205: If not, then proceed to the second dehumidification mode.

[0096] In other words, in addition to the first dehumidification mode, the air conditioning system can also be set to a second dehumidification mode. The second dehumidification mode is different from the first dehumidification mode. At the same time, the system can determine whether to run the first dehumidification mode or the second dehumidification mode based on the relationship between the initial room temperature and the first preset condition.

[0097] For example, if it is determined that the second dehumidification mode is to be entered, the method further includes: controlling both the first circulation loop and the second circulation loop to operate in a cooling mode.

[0098] In other words, in the second dehumidification mode, both the first and second circulation loops can be controlled to operate in a cooling mode, which is equivalent to both the first and second indoor heat exchangers being used for condensation dehumidification.

[0099] It should be noted that in the second dehumidification mode, it is not limited to controlling both the first and second circulation loops to operate in cooling mode. For example, in some embodiments, in the second dehumidification mode, only the first circulation loop can be controlled to operate in cooling mode, while the second circulation loop does not operate. Alternatively, only the second circulation loop can be controlled to operate in cooling mode, while the first circulation loop does not operate.

[0100] The first preset condition can be set as needed. For example, the first preset condition can be: the first difference between the initial room temperature and the set dehumidification temperature is less than the first set value, wherein the first set value is greater than 0°C.

[0101] Specifically, the dehumidification temperature setting refers to the theoretical temperature of the indoor environment under dehumidification mode.

[0102] Let T0 represent the initial room temperature, Ts represent the set dehumidification temperature, and S1 represent the first set value. Then the first preset condition is: T0 - Ts < S1. The value of S1 can be determined as needed. For example, S1 can be greater than 0°C and less than or equal to 10°C. More preferably, S1 can be 5°C.

[0103] If T0 - Ts < S1, it means that the current indoor ambient temperature is close to the theoretical temperature of the indoor environment under dehumidification mode. Therefore, the first dehumidification mode can be run to control the heating operation of the second circulation loop to avoid the indoor ambient temperature from dropping below the theoretical temperature as much as possible.

[0104] In some embodiments, the first preset condition may also be: T0-Ts≤S1.

[0105] In addition, the air conditioning system is not limited to having both a first dehumidification mode and a second dehumidification mode. In some embodiments, the air conditioning system may only have a first dehumidification mode and no second dehumidification mode. For an air conditioning system with only a first dehumidification mode, it is not necessary to determine whether the initial room temperature meets the first preset condition.

[0106] In one embodiment, in the first dehumidification mode, the method further includes: adjusting the opening of the second throttling device according to the heating capacity of the second indoor heat exchanger. That is, the refrigerant flow rate of the second circulation loop can be adjusted according to the current heating capacity of the second indoor heat exchanger so that the indoor ambient temperature is as close as possible to the set dehumidification temperature, thereby keeping the indoor ambient temperature approximately constant.

[0107] There are various ways to adjust the opening of the second throttling device according to the heating capacity of the second indoor heat exchanger. For example, in one embodiment, please refer to... Figure 5 The method includes:

[0108] Step S301: Determine that the initial running time of the air conditioning system in the first dehumidification mode has reached the set duration;

[0109] Initial runtime refers to the initial runtime of the air conditioning system after it enters the first dehumidification mode.

[0110] The set duration can be determined as needed. For example, the set duration can be 5 minutes to 30 minutes, and more preferably, the set duration can be 15 minutes.

[0111] Step S302: Obtain the first current room temperature and the current temperature of the first indoor heat exchanger;

[0112] The first current room temperature refers to the current indoor ambient temperature obtained after the initial running time has reached the set duration.

[0113] Step S303: Record the first difference between the first current room temperature and the current temperature of the first indoor heat exchanger;

[0114] Let T1 represent the first current room temperature, TEa represent the current temperature of the first indoor heat exchanger, and ΔT represent the first difference. Then ΔT = T1 - TEa.

[0115] Step S304: Obtain the current temperature of the second indoor heat exchanger and the exhaust temperature of the first cylinder;

[0116] Temperature sensors can be installed on the second indoor heat exchanger and near the first exhaust port of the first cylinder. The current temperature of the second indoor heat exchanger and the exhaust temperature of the first cylinder can be obtained through the corresponding temperature sensors.

[0117] Step S305: Use the current temperature of the second indoor heat exchanger, the exhaust temperature of the first cylinder, and the first difference to determine the heating capacity of the second indoor heat exchanger;

[0118] Step S306: Adjust the opening of the second throttling device according to the judgment result.

[0119] In other words, the current heating capacity of the second indoor heat exchanger can be determined based on the relationship between the current temperature of the second indoor heat exchanger, the exhaust temperature of the first cylinder, and the first difference, and the opening of the second throttling device can be adjusted accordingly based on the determination result.

[0120] For example, the heating capacity of the second indoor heat exchanger can be determined by using the current temperature of the second indoor heat exchanger, the exhaust temperature of the first cylinder, and the first difference. This can be done by: determining whether the second difference between the current temperature of the second indoor heat exchanger and the first current room temperature is greater than or equal to 1 / 2 of the first difference; if so, determining whether the exhaust temperature of the first cylinder is less than or equal to a second set value, wherein the second set value is greater than 0°C.

[0121] Specifically, let TEb represent the current temperature of the second indoor heat exchanger, TPa represent the exhaust temperature of the first cylinder, and S2 represent the second set value. Then, determining whether the second difference between the current temperature of the second indoor heat exchanger and the first current room temperature is greater than or equal to 1 / 2 of the first difference can be expressed as determining whether the second difference between the current temperature of the second indoor heat exchanger and the first current room temperature satisfies: TEb-T1≥△T / 2. If it satisfies this, then it is further determined whether the exhaust temperature of the first cylinder is less than or equal to the second set value, that is, whether it satisfies: TPa≤S2. The value of S2 can be determined as needed. For example, S2 can be 60℃~90℃, and more preferably, S2 can be 75℃.

[0122] If TPa≤S2, it means that the current heating capacity of the second indoor heat exchanger is relatively low. Therefore, the opening of the second throttling device can be reduced accordingly to improve the heating capacity of the second indoor heat exchanger.

[0123] It should be noted that each time TEb-T1≥△T / 2 and TPa≤S2 are determined, the opening of the second throttling device can be adjusted once. The number of steps to reduce the opening each time can be determined as needed. For example, it can be reduced by 5 to 30 steps each time. More preferably, it can be reduced by 10 steps each time.

[0124] In some embodiments, it can also be determined whether the second difference between the current temperature of the second indoor heat exchanger and the first current room temperature is greater than 1 / 2 of the first difference, that is, whether the following condition is met: TEb-T1>△T / 2. Alternatively, it can be determined whether the exhaust temperature of the first cylinder is less than the second set value, that is, whether the following condition is met: TPa<S2.

[0125] Furthermore, in one embodiment, if the exhaust temperature of the first cylinder does not meet the requirement of being less than or equal to a second set value, the method further includes: obtaining a second current room temperature; determining that a third difference between the second current room temperature and the initial room temperature is greater than or equal to a third set value, wherein the third set value is greater than 0°C; and increasing the opening of the second throttling device.

[0126] Specifically, the second current room temperature refers to the current indoor ambient temperature obtained after determining that the exhaust temperature of the first cylinder does not meet the requirement of being less than or equal to the second set value.

[0127] Let T2 represent the second current room temperature and S3 represent the third set value. The value of S3 can be determined as needed. For example, S3 can be greater than 0°C and less than or equal to 5°C. More preferably, S3 can be 2°C.

[0128] If it is determined that T2-T0≥S3, it means that the current heating capacity of the second indoor heat exchanger is relatively high. Therefore, the opening of the second throttling device can be increased accordingly to reduce the heating capacity of the second indoor heat exchanger.

[0129] It should be noted that after each determination that T2-T0≥S3, the opening of the second throttling device can be adjusted once. The number of steps to increase each time can be determined as needed. For example, it can be increased by 5 to 30 steps each time. More preferably, it can be increased by 10 steps each time.

[0130] In addition, if the third difference between the second current room temperature and the initial room temperature does not satisfy the requirement of being greater than or equal to the third set value, that is, not satisfying T2-T0≥S3, then the current opening degree is maintained.

[0131] In some embodiments, it can also be determined that the third difference between the second current room temperature and the initial room temperature is greater than the third set value, that is, it is determined that T2-T0>S3, then the opening degree of the second throttling device is increased.

[0132] Furthermore, after increasing the opening degree of the second throttling device, the method may further include: determining that the opening degree of the second throttling device reaches its maximum value; and controlling the second circulation loop to stop operating.

[0133] Specifically, if it is determined that the opening of the second throttling device has reached its maximum value, it means that the heating capacity of the second indoor heat exchanger can no longer be reduced. In other words, the current indoor ambient temperature is relatively high, and the indoor ambient temperature cannot be reduced by further increasing the opening of the second throttling device. Therefore, the second circulation loop can be controlled to stop operating, that is, the heating operation can be stopped to stop heating the room.

[0134] In some embodiments, after determining that the third difference between the second current room temperature and the initial room temperature is greater than or equal to the third set value, it is first determined whether the opening degree of the second throttling device has reached the maximum value. If the maximum value has been reached, the second circulation loop is controlled to stop operating. If the maximum value has not been reached, the opening degree of the second throttling device is increased.

[0135] There are several ways to stop the second loop from operating; for example, please refer to [link to relevant documentation]. Figure 1 The air conditioning system can be equipped with a signal valve 70, which is used to open or close the second circulation loop 60. In other words, the operation of the second circulation loop 60 can be controlled by the signal valve 70.

[0136] There are several ways to configure the signal valve 70; for example, please refer to [link to example]. Figure 1 The signal valve 70 has a first working port 71, a second working port 72, and a third working port 73. For example, the signal valve 70 can be a three-way valve. The first cylinder has a first exhaust port 14 and a first return port 12; the second cylinder has an opening signal port 11; the first working port 71 is connected to the first circulation loop 50 located between the first exhaust port 14 and the first four-way valve 41, the second working port 72 is connected to the first circulation loop 50 located between the first return port 12 and the first four-way valve 41, and the third working port 73 is connected to the opening signal port 11.

[0137] Specifically, when the signal valve 70 is de-energized, the second circulation loop 60 is in a conductive state. When the signal valve 70 is energized, the flow path between the second working port 72 and the third working port 73 is connected, and the high pressure of the second cylinder is released. Thus, the second circulation loop 60 can be controlled to stop operating.

[0138] In another embodiment, please refer to Figure 6 The opening degree of the second throttling device is adjusted according to the heating capacity of the second indoor heat exchanger, including:

[0139] Step S401: Obtain the third current room temperature;

[0140] The third current room temperature refers to the current indoor ambient temperature obtained after entering the first dehumidification mode.

[0141] Step S402: Determine that the fourth difference between the set dehumidification temperature and the third current room temperature is greater than or equal to the fourth set value and less than or equal to the fifth set value, wherein the fifth set value is greater than the fourth set value;

[0142] Specifically, let T3 represent the third current room temperature, S4 represent the fourth set value, and S5 represent the fifth set value. Then, the fourth difference between the set dehumidification temperature and the third current room temperature being greater than or equal to the fourth set value and less than or equal to the fifth set value can be expressed as: S4≤Ts–T3≤S5. The value of S5 can be determined as needed. For example, S5 can be greater than 0℃ and less than or equal to 2℃. More preferably, S5 can be 1℃. S4 can be less than 0℃ and greater than or equal to -2℃. More preferably, S4 can be -1℃.

[0143] In some embodiments, the condition S4≤Ts–T3≤S5 can also be changed to S4≤Ts–T3<S5, S4<Ts–T3≤S5, or S4<Ts–T3<S5.

[0144] Step S403: Obtain the air outlet temperature of the indoor unit;

[0145] A temperature sensor can be installed at the air outlet of the indoor unit to obtain the air outlet temperature.

[0146] In other words, if S4≤Ts–T0≤S5 is satisfied, then the outlet air temperature of the indoor unit is obtained.

[0147] Step S404: Use the outlet air temperature to determine the heating capacity of the second indoor heat exchanger;

[0148] Step S405: Adjust the opening of the second throttling device according to the judgment result.

[0149] In other words, the current heating capacity of the second indoor heat exchanger can be determined by the outlet air temperature, and the opening of the second throttling device can be adjusted accordingly based on the determination result.

[0150] For example, the heating capacity of the second indoor heat exchanger can be determined by using the outlet air temperature: determining whether the fifth difference between the outlet air temperature and the set dehumidification temperature is greater than or equal to the sixth set value and less than or equal to the seventh set value, wherein the seventh set value is the sixth set value.

[0151] Specifically, let Tc represent the outlet air temperature, S6 represent the sixth set value, and S7 represent the seventh set value. Then, judging whether the fifth difference between the outlet air temperature and the set dehumidification temperature is greater than or equal to the sixth set value and less than or equal to the seventh set value can be expressed as judging whether the following condition is met: S6≤Tc-Ts≤S7. The value of S7 can be determined as needed. For example, S7 can be greater than 0℃ and less than or equal to 2℃. More preferably, S7 can be 1℃. S6 can be less than 0℃ and greater than or equal to -2℃. More preferably, S6 can be -1℃.

[0152] If the fifth difference satisfies S6≤Tc-Ts≤S7, then maintain the current opening degree.

[0153] If the fifth difference does not satisfy S6≤Tc-Ts≤S7, meaning the fifth difference may be less than the sixth set value (Tc-Ts<S6) or greater than the seventh set value (Tc-Ts>S7), then it indicates that the opening of the second throttling device needs to be adjusted.

[0154] For example, if it is determined that the fifth difference is less than the sixth set value, i.e., Tc-Ts<S6, the exhaust temperature of the first cylinder can be further obtained. If it is determined that the exhaust temperature of the first cylinder is less than or equal to the eighth set value, wherein the eighth set value is greater than 0°C, the opening of the second throttling device is reduced.

[0155] Specifically, S8 represents the eighth set value, where the value of S8 can be determined as needed. For example, S8 can be 60℃~90℃, and more preferably, S8 can be 75℃. If it is determined that Tc-Ts<S6 and TPa≤S8, it means that the current heating capacity of the second indoor heat exchanger is relatively low. Therefore, the opening of the second throttling device can be reduced accordingly to improve the heating capacity of the second indoor heat exchanger.

[0156] In some embodiments, if the exhaust temperature of the first cylinder is determined to be less than an eighth set value, i.e., TPa < S8, then the opening of the second throttling device can be reduced.

[0157] It should be noted that each time Tc-Ts < S6 and TPa ≤ S8 is determined, the opening of the second throttling device can be adjusted once. The number of steps to be reduced each time can be determined as needed. For example, it can be reduced by 5 to 30 steps each time. More preferably, it can be reduced by 10 steps each time.

[0158] For example, if it is determined that the fifth difference is greater than the seventh set value, i.e., Tc-Ts>S7, it means that the current heating capacity of the second indoor heat exchanger is relatively high. Therefore, the opening of the second throttling device can be increased accordingly to reduce the heating capacity of the second indoor heat exchanger.

[0159] It should be noted that after each determination that Tc-Ts>S7, the opening of the second throttling device can be adjusted once. The number of steps to increase each time can be determined as needed. For example, it can be increased by 5 to 30 steps each time. More preferably, it can be increased by 10 steps each time.

[0160] In some embodiments, the condition S6≤Tc-Ts≤S7 can also be changed to S6≤Tc-Ts<S7, S6<Tc-Ts≤S7, or S6<Tc-Ts<S7. Other judgment conditions based on S6 and S7 can be adjusted accordingly, which will not be elaborated here.

[0161] Furthermore, after increasing the opening degree of the second throttling device, the method may also include: determining that the opening degree of the second throttling device reaches its maximum value; and controlling the second circulation loop to stop operating.

[0162] In other words, similar to the previous embodiment, if it is determined that the opening of the second throttling device has reached its maximum value, the second circulation loop can be controlled to stop operating, that is, the heating operation can be stopped to stop heating the room.

[0163] In some embodiments, after determining that the fifth difference is greater than or equal to or greater than the seventh set value, it is also possible to first determine whether the opening degree of the second throttling device has reached the maximum value. If the maximum value has been reached, the second circulation loop is controlled to stop running. If the maximum value has not been reached, the opening degree of the second throttling device is increased.

[0164] The following specific embodiment illustrates a dehumidification control method of this application. Please refer to [link / reference]. Figure 7 The dehumidification control method includes the following steps:

[0165] Step S501: Enter dehumidification mode;

[0166] Step S502: Obtain the initial room temperature T0;

[0167] Step S503: Determine whether the initial room temperature T0 and the set dehumidification temperature satisfy: T0 - Ts < S1. If yes, proceed to step S504; otherwise, proceed to step S505.

[0168] Step S504: Enter the first dehumidification mode, control the first circulation loop to run in cooling mode, and the second circulation loop to run in heating mode;

[0169] Step S505: Enter the second dehumidification mode, and control both the first and second circulation loops to run in cooling mode;

[0170] Step S506: Determine that the initial running time has reached the set duration t;

[0171] Step S507: Obtain the first current room temperature T1 and the current temperature TEa of the first indoor heat exchanger;

[0172] Step S508: Record the first difference △T between the first current room temperature T1 and the current temperature TEa of the first indoor heat exchanger, that is, record △T = T1 - TEa;

[0173] Step S509: Obtain the current temperature TEb of the second indoor heat exchanger and the exhaust temperature TPa of the first cylinder;

[0174] Step S510: Determine whether the second difference TPa between the current temperature TEb of the second indoor heat exchanger and the first current room temperature satisfies: TEb-T1≥△T / 2. If yes, proceed to step S511; otherwise, proceed to step S512.

[0175] Step S511: Determine whether the exhaust temperature TPa of the first cylinder satisfies the second set value S2: TPa≤S2. If yes, proceed to step S513; otherwise, proceed to step S514.

[0176] Step S512: Maintain the current opening of the second throttling device;

[0177] Step S513: Reduce the opening of the second throttling device;

[0178] After reducing the opening of the second throttling device, we can return to step S509.

[0179] Step S514: Obtain the second current room temperature T2;

[0180] Step S515: Determine whether the third difference between the second current room temperature T2 and the initial room temperature T0 satisfies: T2 - T0 ≥ S3. If yes, proceed to step S516; otherwise, proceed to step S512.

[0181] Step S516: Increase the opening of the second throttling device;

[0182] Step S517: Determine whether the opening of the second throttling device has reached the maximum value. If yes, proceed to step S518; otherwise, proceed to step S509.

[0183] Step S518: Control the second loop to stop running;

[0184] Step S519: End.

[0185] The following describes another specific embodiment of the dehumidification control method of this application. Please refer to [link / reference]. Figure 8 The dehumidification control method includes the following steps:

[0186] Step S601: Enter dehumidification mode;

[0187] Step S602: Obtain the initial room temperature T0;

[0188] Step S603: Determine whether the initial room temperature T0 and the set dehumidification temperature satisfy: T0 - Ts < S1. If yes, proceed to step S604; otherwise, proceed to step S605.

[0189] Step S604: Enter the first dehumidification mode, control the first circulation loop to run in cooling mode, and the second circulation loop to run in heating mode;

[0190] Step S605: Enter the second dehumidification mode, and control both the first and second circulation loops to run in cooling mode;

[0191] Step S606: Obtain the third current room temperature T3;

[0192] Step S607: Determine whether the set dehumidification temperature Ts, the third current room temperature T3, the fourth set value S4, and the fifth set value S5 satisfy: S4≤Ts–T3≤S5. If yes, proceed to step S608; otherwise, proceed to step S610.

[0193] Step S608: Obtain the outlet air temperature Tc of the indoor unit;

[0194] Step S609: Determine whether the outlet air temperature Tc, the set dehumidification temperature Ts, the sixth set value S6, and the seventh set value S7 satisfy: S6≤Tc-Ts≤S7. If yes, proceed to step S610; otherwise, proceed to step S611.

[0195] Step S610: Maintain the current opening of the second throttling device;

[0196] Step S611: Determine whether the outlet air temperature Tc, the set dehumidification temperature Ts, and the sixth set value S6 satisfy: Tc-Ts<S6. If yes, proceed to step S612; otherwise, proceed to step S615.

[0197] Step S612: Obtain the exhaust temperature TPa of the first cylinder;

[0198] Step S613: Determine whether the exhaust temperature Tpa of the first cylinder satisfies the eighth set value: TPa≤S8. If yes, proceed to step S614; otherwise, proceed to step S610.

[0199] Step S614: Reduce the opening of the second throttling device;

[0200] After reducing the opening of the second throttling device, we can return to step S606.

[0201] Step S615: Increase the opening of the second throttling device;

[0202] Step S616: Determine whether the opening of the second throttling device has reached the maximum value. If yes, proceed to step S617; otherwise, proceed to step S606.

[0203] Step S617: Control the second loop to stop running;

[0204] Step S618: End.

[0205] The various embodiments / implementations provided in this application can be combined with each other without creating contradictions.

[0206] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A dehumidification control method of an air conditioning system, characterized by, The air conditioning system includes a compressor, an indoor unit, an outdoor unit, a control valve assembly, a first circulation loop, and a second circulation loop independent of the first circulation loop. The compressor includes a first cylinder and a second cylinder. The indoor unit includes a first indoor heat exchanger and a second indoor heat exchanger. The outdoor unit includes a first outdoor heat exchanger and a second outdoor heat exchanger. The control valve assembly includes a first four-way valve, a second four-way valve, a first throttling device, and a second throttling device. The first cylinder, the first four-way valve, the first outdoor heat exchanger, the first throttling device, and the first indoor heat exchanger are disposed on the first circulation loop. The second cylinder, the second four-way valve, the second outdoor heat exchanger, the second throttling device, and the second indoor heat exchanger are disposed on the second circulation loop, and the second indoor heat exchanger is located downstream of the first indoor heat exchanger along the airflow direction. The dehumidification mode of the air conditioning system includes at least a first dehumidification mode, and the method includes: Confirm entry into the first dehumidification mode; The first circulation loop is controlled to operate in cooling mode, and the second circulation loop is controlled to operate in heating mode; The opening degree of the second throttling device is adjusted according to the heating capacity of the second indoor heat exchanger, wherein the adjustment includes: Determine that the initial operating time of the air conditioning system in the first dehumidification mode reaches the set duration; Obtain the first current room temperature and the current temperature of the first indoor heat exchanger; Record the first difference between the first current room temperature and the current temperature of the first indoor heat exchanger; Obtain the current temperature of the second indoor heat exchanger and the exhaust temperature of the first cylinder; Determine whether the second difference between the current temperature of the second indoor heat exchanger and the first current room temperature is greater than or equal to 1 / 2 of the first difference; If so, determine whether the exhaust temperature of the first cylinder is less than or less than or equal to a second set value, wherein the second set value is greater than 0°C; If so, then reduce the opening of the second throttling device.

2. The dehumidification control method according to claim 1, characterized by, The dehumidification mode further includes a second dehumidification mode, and the method further includes: Confirm entry into the dehumidification mode; Obtain the initial room temperature; Determine whether the initial room temperature meets the first preset condition; If so, then proceed to the first dehumidification mode; If not, then proceed to the second dehumidification mode.

3. The dehumidification control method according to claim 2, wherein If it is determined that the second dehumidification mode will be entered, the method further includes: Both the first and second circulation loops are controlled to operate in a cooling mode.

4. The dehumidification control method according to claim 2, characterized in that, The first preset condition is: the first difference between the initial room temperature and the set dehumidification temperature is less than or less than or equal to a first set value, wherein the first set value is greater than 0°C.

5. The dehumidification control method according to claim 1, characterized in that, If the exhaust temperature of the first cylinder does not meet the requirement of being less than or equal to the second set value, the method further includes: Get the second current room temperature; The third difference between the second current room temperature and the initial room temperature is determined to be greater than or equal to a third set value, wherein the third set value is greater than 0°C; Increase the opening of the second throttling device.

6. The dehumidification control method according to claim 1, characterized in that, The adjustment also includes: Get the third current room temperature; The fourth difference between the set dehumidification temperature and the third current room temperature is determined to be greater than or equal to the fourth set value and less than or equal to the fifth set value, wherein the fifth set value is greater than the fourth set value; Obtain the outlet air temperature of the indoor unit; The heating capacity of the second indoor heat exchanger is determined using the outlet air temperature. The opening degree of the second throttling device is adjusted according to the judgment result.

7. The dehumidification control method according to claim 6, characterized in that, The method includes: Determine whether the fifth difference between the outlet air temperature and the set dehumidification temperature is greater than or equal to the sixth set value and less than or equal to the seventh set value, wherein the seventh set value is greater than the sixth set value; If not, the opening degree of the second throttling device is adjusted according to the judgment result.

8. The dehumidification control method according to claim 7, characterized in that, The adjustment also includes: The fifth difference is determined to be less than or equal to the sixth set value; Obtain the exhaust temperature of the first cylinder; The exhaust temperature of the first cylinder is determined to be less than or equal to an eighth set value, wherein the eighth set value is greater than 0°C; Reduce the opening of the second throttling device.

9. The dehumidification control method according to claim 7, characterized in that, The adjustment also includes: The fifth difference is determined to be greater than or equal to the seventh set value; Increase the opening of the second throttling device.

10. The dehumidification control method according to claim 5 or 9, characterized in that, After increasing the opening of the second throttling device, the method further includes: Determine that the opening degree of the second throttling device has reached its maximum value; Control the second loop to stop running.

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